The limit of detection improvement in TLC determination of uranium and thorium in the presence of other metal ions

Hodisan, T.; Curtui, M.; Cobzac, Simona Codruța Aurora; Cimpoiu, Claudia; Haiduc, Ionel

doi:10.1007/bf02385377

Cited by 14 publications

(5 citation statements)

References 11 publications

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Section: ■ Introductionmentioning

confidence: 99%

“…Therefore, it is necessary to develop simple methods with excellent sensitivity and specificity to detect and harvest uranyl ions. Various analytical methods have been used to detect uranyl ions, including optical spectroscopy (e.g., fluorescence spectroscopy, spectrophotometry, optode, and Raman spectroscopy , ), mass spectrometry, separation methods, and electrochemical analysis. − Recently, various methods using biological molecules to detect uranyl ions have also been developed. , Zhou et al previously reported an α-helical peptide, called super uranyl binding protein or SUP, that binds UO 2 2+ with femtomolar affinity and remarkable selectivity, better than 10,000-fold affinity over other common metal ions. The X-ray structure of this peptide was determined with both UO 2 2+ absent (PDB ID: 4FZO) and bound (PDB ID: 4FZP) and revealed that the SUP conformation changes only slightly in response to UO 2 2+ -binding.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Structure of the Surface-Immobilized Super Uranyl Binding Protein

et al. 2021

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Recently, a super uranyl binding protein (SUP) was developed, which exhibits excellent sensitivity/selectivity to bind uranyl ions. It can be immobilized onto a surface in sensing devices to detect uranyl ions. Here, sum frequency generation (SFG) vibrational spectroscopy was applied to probe the interfacial structures of surface-immobilized SUP. The collected SFG spectra were compared to the calculated orientation-dependent SUP SFG spectra using a one-excitonic Hamiltonian approach based on the SUP crystal structures to deduce the most likely surface-immobilized SUP orientation(s). Furthermore, discrete molecular dynamics (DMD) simulation was applied to refine the surface-immobilized SUP conformations and orientations. The immobilized SUP structures calculated from DMD simulations confirmed the SUP orientations obtained from SFG data analyzed based on the crystal structures and were then used for a new round of SFG orientation analysis to more accurately determine the interfacial orientations and conformations of immobilized SUP before and after uranyl ion binding, providing an in-depth understanding of molecular interactions between SUP and the surface and the effect of uranyl ion binding on the SUP interfacial structures. We believe that the developed method of combining SFG measurements, DMD simulation, and Hamiltonian data analysis approach is widely applicable to study biomolecules at solid/liquid interfaces.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Structure of the Surface-Immobilized Super Uranyl Binding Protein

et al. 2021

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“…-The thin layer chromatography (Hodisan at al., 1998) is also used for the determination of uranium and thorium in presence of other metal ions using the iso-acid propyldithiophosphoric (PRDTP-i) in mobile phase as a complexing agent to differentiate between the species studied by modification of their retention time.…”

Section: Introductionmentioning

confidence: 99%

Determination of Uranium and Thorium in the Industrial Phosphoric Acid Using X-Ray Fluorescence Spectrometry with Wavelength Dispersive (WDXRF)

Guitouni¹

2016

IJC

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The method of determination for uranium and thorium in the industrial phosphoric acid by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) responds positively to all the validation tests and can be adopted for the dosage for these elements. It is clear that the procedure of the proposed method is simple and requires less time to complete the analysis. The concentration for uranium and thorium in the Tunisian phosphoric acid is in the order of 22 ppm for uranium with a coefficient of variation of 0.77% and of about 4 ppm for thorium with a coefficient of variation of 1.37%.

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“…In view of this extraction and determination of U(VI) from surface and ground water has become a matter of great interest. 1,2 The literature citation revealed that there are various analytical techniques for the estimation of uranium which include thin layer chromatography, 3 gravimetry, 4 titrimetry, 5 fluorimetry, 6,7 potentiometry, 8 polarography, 9 X-ray fluorescence, 10 inductively coupled plasma mass spectrometry. 11 In addition, spectrophotometric methods have also been employed to determine U(VI) in presence of thorium(IV), 12 ore leachates, 13 natural waters, [14][15][16] process streams of a uranium extraction plant 17 and soil.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of U(VI) with Rifampicin in Soil Samples

Lutfullah

Sharma

Rahmana

et al. 2011

J Chinese Chemical Soc

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A validated spectrophotometric method has been developed for the determination of uranyl ion in soil samples. The method is based on the complexation reaction between uranyl ion and rifampicin in methanol-water medium at room temperature. The method is followed spectrophotometrically by measuring the absorbance at 375 nm. Under the optimized experimental conditions, Beer's law is obeyed in the concentration range of 1.35-20.25 mg mL -1 with apparent molar absorptivity and Sandell's sensitivity of 8.0 × 10 3 L mol -1 cm -1 and 0.042 mg/cm 2 /0.001 absorbance unit, respectively. The interference of a large number of anions and cations has been investigated and the optimized conditions developed have been utilized for the determination of uranium(VI) in soil samples. The three sigma detection limit (n = 9) for uranyl ion was found to be 0.20 mg mL -1 . The proposed method was successfully applied to the determination of uranyl ion in soil samples.

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The limit of detection improvement in TLC determination of uranium and thorium in the presence of other metal ions

Cited by 14 publications

References 11 publications

Molecular Structure of the Surface-Immobilized Super Uranyl Binding Protein

Molecular Structure of the Surface-Immobilized Super Uranyl Binding Protein

Determination of Uranium and Thorium in the Industrial Phosphoric Acid Using X-Ray Fluorescence Spectrometry with Wavelength Dispersive (WDXRF)

Spectrophotometric Determination of U(VI) with Rifampicin in Soil Samples

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